Electric telegraph.



No. 781,416. PATBNTED JAN. 31, 1905- W. D. GREGGRY WITNESSES: 5 1

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UNITED STATES Patented January 31, 1905.

PATENT Grrrce.

ELECTRIC TELEGRAPH.

SPECIFICATION forming part of Letters Patent 'No. 781,416, dated January 31, 1905.

Application filed March 30,

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Be it known that I, VVILLIs D. GREGORY, a citizen of the United States, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented or discovered certain new and useful Improvements in Electric Telegraphs, of which improvements the following is a specification.

In an application filed March 30, 190e, Serial No, 200,755, I have shown and described certain improvements in telegraph instruments wherein provision is made for a double break in the circuits and for the automatic adjustment of the position of such breaking devices so to insure simultaneous formation of both breaks by the movement of one of the parts, as a block or head, carrying the relatively stationary contacts. In this case I provide for such double break and automatic adjustment by means of a movable part or member carried by the armature.

The invention is hereinafter more fully described and claimed.

In the accompanying drawings, forming a part of this specification, Figure 1 is a plan view of my improved relay. Fig. 2 is a sectional elevation of the same, and Fig. 3 is a diagrammatic view illustrating the circuits of the instrument.

In the practice of my invention the electromagnets 1 are secured to a suitable base or foundation 2 in any suitable manner, and the armature-lever 3 is pivotally mounted on the base in suitable relation to the electromagnets. On a threaded stem 4 of the lever is mounted a head or block 5, of insulating material, iitting loosely, so as to swing freely back and forth, as hereinbefore described. On oppo site sides of the head of insulating material are secured conducting-strips 7 and 8, provided, respectively, with contact-pins 9 9 and 10 10*. These contact-pins are adapted to strike on the movement of the armature against similarly-arranged pins 11 11 on the block 12 and 13 13 on the block 1 L. These blocks are formed of insulating material and are secured, respectively, to the supportingframe 15 and to a slide 16, mounted upon the frame 15 and adapted to be shifted back and forth forthe proper adjustment of the con- 1904:. Serial No. 200,756

l tact-pins with relation to the armature-lever. These pins are connected, respectively, to suitable wires forming the circuits as, for example, the pins 11 and 13 are connected to opposite terminals of the generator or generators and the pins 11 and 13 are connected to the line-wire, so that when the armature is in one position a positive current will pass out through the line-wire; but when the armature is shifted a current from the negative pole or a reversed current will pass out through the line-wire.

As the head 5 is mounted to turn freely on the stem 4, it follows that when the armaturelever is shifted the head will be turned, if not in proper position, to bring both points or pins carried by the head into contact with one pair of.stationary pins. In case one of the pins in the head should not leave the stationary pin when the armature is shifted the striking of the diagonal opposite pin on the head against the facing stationary pin will turn the head and form a second break in the circuit. This construction will prevent the formation of an are or its immediate destruction in case one should be formed.

As the high-tension current is generally used on what is termed the long end of the line, I have shown a second relay of the form or construction heretofore employed, with its usual circuits, for use on the short end of the battery on which a low-tension current is used, and consequently there is small liability of arcing.

I claim herein as my invention 1. A telegraph instrument having in combination a magnet, a lever, an armature carried by the lever, a head carrying a pair of contact-pins carried by the lever and movable independent of the armature, and a pair of contact pins or points arranged opposite the pins on the head, substantially as set forth.

2. A telegraph instrument having in combination a magnet, a lever, an armature carried by the lever, a head carrying two pairs of contact-pins projecting from opposite sides of the head, said head being carried by the lever and movable independent of the armature, and two pairs of contact pins or points arranged on opposite sides of the head so as to contact alternately with the pairs of pins on the head when the latter is oscillated, substantially as set forth.

8. A telegraph instrument having in combination a lover, a head carrying a pair of contact pins or points and rotatably mounted on the lever. an armature mounted directly on the lever, and a pair of contact pins or points arranged opposite the pins on the head, substantially as set forth.

4. A telegraph instrument having in combination an electromagnet, a lever carrying an armature, a head pivotall y mounted on the lever, two pairs of pins projecting from opposite sides of the head and two pairs of pins arranged on opposite sides of the head so as to contact alternately with the pins on the head, the pins of two of the pairs being electrically connected, one of the other pins having its pairs connected respectively to source of opposite polarity and the pins of the fourth pair connected to the line-wire, substantially as set forth.

5. A telegraph instrument having in combination an electromagnet, a lever carrying an armature, a head pivotally mounted on the lever, two pairs of pins projecting from opposite sides of the head, the pins of each pair being electrically connected, two pairs of pins arranged on opposite sides of the head so as to contact alternately with the pins on the head, the pins of one pair being connected respectively to sources of opposite polarity and the pins of the other pair connected to the line wire, substantially as set forth,

In testimony whereof I have hereunto set my hand.

WVILLIS D. GREGORY.

Vitnesses:

DARWIN S. oLoo'r'r, F. E. GAITHER. 

